Silent Drill to Sneak Up and Drill You When You Least Expect

If you hate going to the dentist, they’re trying to make it better:

An invention which cancels out the noise of a dentist’s drill could help people overcome their fear of a check-up, researchers say. … This new device allows patients to listen to music on an MP3 player, while the sound of the drill is blanked out. … The device is similar to noise cancelling headphones.

Yes, but a silent drill means the drill could be anywhere! Also, the caption on that photo. Some people find the sound of a dentist’s drill distressing? Others are like, “I love it! It’s so high, it’s like a little woman singing one long, awesome song. Laaaa!”